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Mathematics
Problem
The eccentricity of an ellipse whose centre is at the origin is
1
/
2
1/2
1/2
. If one of its directrices is
x
=
−
4
x = -4
x
=
−
4
, then the equation of the normal to it at
(
1
,
3
/
2
)
(1, 3/2)
(
1
,
3/2
)
is a.
x
+
2
y
=
4
x + 2y = 4
x
+
2
y
=
4
b.
2
y
−
x
=
2
2y - x = 2
2
y
−
x
=
2
c.
4
x
−
2
y
=
1
4x - 2y = 1
4
x
−
2
y
=
1
d.
4
x
+
2
y
=
7
4x + 2y = 7
4
x
+
2
y
=
7
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